At 09:24 AM 07/27/10, you wrote: > > Mike Morris <wa6...@...> wrote: > > > But there are ways around it. The simple method: > > Have a local 1950 oscillator at the voter site. It can be done > > with a 88mh toroid, a few resistors and caps, and a single > > transistor. > >Can't think of the last time I saw an 88mh Toroid for sale in >any obvious location but I'm sure they're out there somewhere >like Ebay. I found some of the newer one-chip GE Status Tone >Encoders on Ebay a few months back and they were cheaper than >I could have easily built them for.
Sure. And I've also seen a status tone encoder made from a LM386. Naturally you'd want to use some high grade resistors and caps when building it. It drove an audio transformer... I have no idea where the guy found a transformer that eight 600 ohm windings... > > Have a SPDT reed relay driven by the link receiver RUS (or COR). > > Links can be on 420Mhz, 438-439Mhz, 900Mhz, or 1200 Mhz. > >... and if you're creative some other places. > > > The NC contact on the relay has 1950hz. NO contact has link > > receiver audio. Armature feeds voter card audio input. > > When channel is idle, card sees 1950hz and is happy. > > When channel is unsquelched card sees link receiver audio > > and votes. > >Wonder if the relay pole contact transition time contributes >to any type of glitch, hunt, delay or erratic event that might >otherwise not be there if you simply (resistance as an example) >mixed and removed the Status Tone? Probably no more than the E&M switching on a microwave shot. > > Reed relays last a long time - I've had used ones last 12 years, > > and new ones last 20, but you can use CMOS audio switches if you > > want. > >CD4053 and use the diagram from an ACC RC-85 Repeater Controller >as your basic guide. Absolutely. > > Documentation on both vintages of the GE voter (grey paint is > > early, black paint is late) is on the GE LBI page at repeater- > > builder. > > Mike WA6ILQ > >The Spectra Tac Voter Manuals pop up on Ebay every so often as >to the GE Version Manuals. If the manual is NLA from Moto we can scan it and post it. >If you "fool the status tone decoder" with a local oscillator, >keep in mind the level of the Status Tone also plays into the >actual performance. It's not just a "tone present" or "tone not >present" function. That's very true. But it's is one way to avoid 24/7 link duty cycle. Another is to configure the voter channel for E&M and then drive the E leads with COR contacts. Mike WA6ILQ
